Title
Two-dimensional hexagonal tin : ab initio geometry, stability, electronic structure and functionalization Two-dimensional hexagonal tin : ab initio geometry, stability, electronic structure and functionalization
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
article
Publication
Bristol :IOP Publishing ,
Subject
Physics
Source (journal)
2D materials. - Bristol, 2014, currens
Volume/pages
1(2014) :2 , 8 p.
ISSN
2053-1583
2053-1583
Article Reference
021004
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
We study the structural, mechanical and electronic properties of the two-dimensional (2D) allotrope of tin: tinene/stanene using first-principles calculation within density functional theory, implemented in a set of computer codes. Continuing the trend of the group-IV 2D materials graphene, silicene and germanene; tinene is predicted to have a honeycomb lattice with lattice parameter of a(0) = 4.62 angstrom and a buckling of d(0) = 0.92 angstrom. The electronic dispersion shows a Dirac cone with zero gap at the Fermi energy and a Fermi velocity of v(F) = 0.97 x 10(6) m s(-1); including spin-orbit coupling yields a bandgap of 0.10 eV. The monolayer is thermally stable up to 700 K, as indicated by first-principles molecular dynamics, and has a phonon dispersion without imaginary frequencies. We explore applied electric field and applied strain as functionalization mechanisms. Combining these two mechanisms allows for an induced bandgap up to 0.21 eV, whilst retaining the linear dispersion, albeit with degraded electronic transport parameters.
E-info
https://repository.uantwerpen.be/docman/iruaauth/5412bf/134432.pdf
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